Day 3 Task: Basic Linux Commands with a Twist

View the content of a file and display line numbers.

$cat -n filename

2. Change the access permissions of files to make them readable, writable, and executable by the owner only.

    $chmod +x filename
   

   

   Check the last 10 commands you have run.

    $history | head -10
   

   

   Remove a directory and all its contents.

    $rm -R /pathofdirectory
   

   

   Create a fruits.txt file, add content (one fruit per line), and display the content.

    $touch fruits.txt
   
    $echo "Pineapple" >> fruits.txt
    $echo "Banana" >> fruits.txt
    $echo "Apple" >> fruits.txt
    $echo "Grapes" >> fruits.txt
    $echo "Guava" >> fruits.txt
    $echo "Orange" >> fruits.txt
   

   

   Add content in devops.txt (one in each line) - Apple, Mango, Banana, Cherry, Kiwi, Orange, Guava. Then, append "Pineapple" to the end of the file.

    $touch devops.txt 
   
    $echo "Banana" >> fruits.txt
    $echo "Apple" >> fruits.txt
    $echo "Orange" >> fruits.txt
   
    #Append pineapple at the end of the list 
    $echo "Pineapple" >> fruits.txt
   

   

   Show the first three fruits from the file in reverse order.

    $sort -r fruits.txt
   

   

   Show the bottom three fruits from the file, and then sort them alphabetically.

    $sort fruits.txt
    $sort fruits.txt | tail -3
   

   

   Create another file Colors.txt, add content (one color per line), and display the content.

    # we can add content vy using vim editor also: 
    $vim colors.txt
   
    # we can use echo command as well
    $echo "Green" >> fruits.txt
    $echo "Pink" >> fruits.txt
    $echo "Red" >> fruits.txt
    $echo "Orange" >> fruits.txt
   

   

   Add content in Colors.txt (one in each line) - Red, Pink, White, Black, Blue, Orange, Purple, Grey. Then, prepend "Yellow" to the beginning of the file.

    # Prepand "Yellow" to the begining of the file 
   
    $sed -i '1i Yellow' colors.txt
    $cat colors.txt
   

   

   Find and display the lines that are common between fruits.txt and Colors.txt.

    comm -12 sorted1.txt sorted2.txt
   

   

   Note - Before giving comm command make sure your comparison file must be sorted.

   Count the number of lines, words, and characters in both fruits.txt and Colors.txt.

    # How to find word count, character count and line count
   
    $wc -c colors.txt
    $wc -l colors.txt
    $wc -w colors.txt